/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/*
 *  Elliptic curve J-PAKE
 *
 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
 *  SPDX-License-Identifier: Apache-2.0
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 */

/*
 * References in the code are to the Thread v1.0 Specification,
 * available to members of the Thread Group http://threadgroup.org/
 */

#if !defined(MBEDTLS_CONFIG_FILE)
#include "tls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#if defined(MBEDTLS_ECJPAKE_C)

#include "tls/ecjpake.h"

#include <string.h>

/*
 * Convert a mbedtls_ecjpake_role to identifier string
 */
static const char *const ecjpake_id[] = {
	"client",
	"server"
};

#define ID_MINE     (ecjpake_id[ctx->role])
#define ID_PEER     (ecjpake_id[1 - ctx->role])

/*
 * Initialize context
 */
void mbedtls_ecjpake_init(mbedtls_ecjpake_context *ctx)
{
	if (ctx == NULL) {
		return;
	}

	ctx->md_info = NULL;
	mbedtls_ecp_group_init(&ctx->grp);
	ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED;

	mbedtls_ecp_point_init(&ctx->Xm1);
	mbedtls_ecp_point_init(&ctx->Xm2);
	mbedtls_ecp_point_init(&ctx->Xp1);
	mbedtls_ecp_point_init(&ctx->Xp2);
	mbedtls_ecp_point_init(&ctx->Xp);

	mbedtls_mpi_init(&ctx->xm1);
	mbedtls_mpi_init(&ctx->xm2);
	mbedtls_mpi_init(&ctx->s);
}

/*
 * Free context
 */
void mbedtls_ecjpake_free(mbedtls_ecjpake_context *ctx)
{
	if (ctx == NULL) {
		return;
	}

	ctx->md_info = NULL;
	mbedtls_ecp_group_free(&ctx->grp);

	mbedtls_ecp_point_free(&ctx->Xm1);
	mbedtls_ecp_point_free(&ctx->Xm2);
	mbedtls_ecp_point_free(&ctx->Xp1);
	mbedtls_ecp_point_free(&ctx->Xp2);
	mbedtls_ecp_point_free(&ctx->Xp);

	mbedtls_mpi_free(&ctx->xm1);
	mbedtls_mpi_free(&ctx->xm2);
	mbedtls_mpi_free(&ctx->s);
}

/*
 * Setup context
 */
int mbedtls_ecjpake_setup(mbedtls_ecjpake_context *ctx, mbedtls_ecjpake_role role, mbedtls_md_type_t hash, mbedtls_ecp_group_id curve, const unsigned char *secret, size_t len)
{
	int ret;

	ctx->role = role;

	if ((ctx->md_info = mbedtls_md_info_from_type(hash)) == NULL) {
		return (MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE);
	}

	MBEDTLS_MPI_CHK(mbedtls_ecp_group_load(&ctx->grp, curve));

	MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&ctx->s, secret, len));

cleanup:
	if (ret != 0) {
		mbedtls_ecjpake_free(ctx);
	}

	return (ret);
}

/*
 * Check if context is ready for use
 */
int mbedtls_ecjpake_check(const mbedtls_ecjpake_context *ctx)
{
	if (ctx->md_info == NULL || ctx->grp.id == MBEDTLS_ECP_DP_NONE || ctx->s.p == NULL) {
		return (MBEDTLS_ERR_ECP_BAD_INPUT_DATA);
	}

	return (0);
}

/*
 * Write a point plus its length to a buffer
 */
static int ecjpake_write_len_point(unsigned char **p, const unsigned char *end, const mbedtls_ecp_group *grp, const int pf, const mbedtls_ecp_point *P)
{
	int ret;
	size_t len;

	/* Need at least 4 for length plus 1 for point */
	if (end < *p || end - *p < 5) {
		return (MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL);
	}

	ret = mbedtls_ecp_point_write_binary(grp, P, pf, &len, *p + 4, end - (*p + 4));
	if (ret != 0) {
		return (ret);
	}

	(*p)[0] = (unsigned char)((len >> 24) & 0xFF);
	(*p)[1] = (unsigned char)((len >> 16) & 0xFF);
	(*p)[2] = (unsigned char)((len >> 8) & 0xFF);
	(*p)[3] = (unsigned char)((len) & 0xFF);

	*p += 4 + len;

	return (0);
}

/*
 * Size of the temporary buffer for ecjpake_hash:
 * 3 EC points plus their length, plus ID and its length (4 + 6 bytes)
 */
#define ECJPAKE_HASH_BUF_LEN    (3 * (4 + MBEDTLS_ECP_MAX_PT_LEN) + 4 + 6)

/*
 * Compute hash for ZKP (7.4.2.2.2.1)
 */
static int ecjpake_hash(const mbedtls_md_info_t *md_info, const mbedtls_ecp_group *grp, const int pf, const mbedtls_ecp_point *G, const mbedtls_ecp_point *V, const mbedtls_ecp_point *X, const char *id, mbedtls_mpi *h)
{
	int ret;
	unsigned char buf[ECJPAKE_HASH_BUF_LEN];
	unsigned char *p = buf;
	const unsigned char *end = buf + sizeof(buf);
	const size_t id_len = strlen(id);
	unsigned char hash[MBEDTLS_MD_MAX_SIZE];

	/* Write things to temporary buffer */
	MBEDTLS_MPI_CHK(ecjpake_write_len_point(&p, end, grp, pf, G));
	MBEDTLS_MPI_CHK(ecjpake_write_len_point(&p, end, grp, pf, V));
	MBEDTLS_MPI_CHK(ecjpake_write_len_point(&p, end, grp, pf, X));

	if (end - p < 4) {
		return (MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL);
	}

	*p++ = (unsigned char)((id_len >> 24) & 0xFF);
	*p++ = (unsigned char)((id_len >> 16) & 0xFF);
	*p++ = (unsigned char)((id_len >> 8) & 0xFF);
	*p++ = (unsigned char)((id_len) & 0xFF);

	if (end < p || (size_t)(end - p) < id_len) {
		return (MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL);
	}

	memcpy(p, id, id_len);
	p += id_len;

	/* Compute hash */
	mbedtls_md(md_info, buf, p - buf, hash);

	/* Turn it into an integer mod n */
	MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(h, hash, mbedtls_md_get_size(md_info)));
	MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(h, h, &grp->N));

cleanup:
	return (ret);
}

/*
 * Parse a ECShnorrZKP (7.4.2.2.2) and verify it (7.4.2.3.3)
 */
static int ecjpake_zkp_read(const mbedtls_md_info_t *md_info, const mbedtls_ecp_group *grp, const int pf, const mbedtls_ecp_point *G, const mbedtls_ecp_point *X, const char *id, const unsigned char **p, const unsigned char *end)
{
	int ret;
	mbedtls_ecp_point V, VV;
	mbedtls_mpi r, h;
	size_t r_len;

	mbedtls_ecp_point_init(&V);
	mbedtls_ecp_point_init(&VV);
	mbedtls_mpi_init(&r);
	mbedtls_mpi_init(&h);

	/*
	 * struct {
	 *     ECPoint V;
	 *     opaque r<1..2^8-1>;
	 * } ECSchnorrZKP;
	 */
	if (end < *p) {
		return (MBEDTLS_ERR_ECP_BAD_INPUT_DATA);
	}

	MBEDTLS_MPI_CHK(mbedtls_ecp_tls_read_point(grp, &V, p, end - *p));

	if (end < *p || (size_t)(end - *p) < 1) {
		ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
		goto cleanup;
	}

	r_len = *(*p)++;

	if (end < *p || (size_t)(end - *p) < r_len) {
		ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
		goto cleanup;
	}

	MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&r, *p, r_len));
	*p += r_len;

	/*
	 * Verification
	 */
	MBEDTLS_MPI_CHK(ecjpake_hash(md_info, grp, pf, G, &V, X, id, &h));
	MBEDTLS_MPI_CHK(mbedtls_ecp_muladd((mbedtls_ecp_group *) grp, &VV, &h, X, &r, G));

	if (mbedtls_ecp_point_cmp(&VV, &V) != 0) {
		ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
		goto cleanup;
	}

cleanup:
	mbedtls_ecp_point_free(&V);
	mbedtls_ecp_point_free(&VV);
	mbedtls_mpi_free(&r);
	mbedtls_mpi_free(&h);

	return (ret);
}

/*
 * Generate ZKP (7.4.2.3.2) and write it as ECSchnorrZKP (7.4.2.2.2)
 */
static int ecjpake_zkp_write(const mbedtls_md_info_t *md_info, const mbedtls_ecp_group *grp, const int pf, const mbedtls_ecp_point *G, const mbedtls_mpi *x, const mbedtls_ecp_point *X, const char *id, unsigned char **p, const unsigned char *end, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
	int ret;
	mbedtls_ecp_point V;
	mbedtls_mpi v;
	mbedtls_mpi h;				/* later recycled to hold r */
	size_t len;

	if (end < *p) {
		return (MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL);
	}

	mbedtls_ecp_point_init(&V);
	mbedtls_mpi_init(&v);
	mbedtls_mpi_init(&h);

	/* Compute signature */
	MBEDTLS_MPI_CHK(mbedtls_ecp_gen_keypair_base((mbedtls_ecp_group *) grp, G, &v, &V, f_rng, p_rng));
	MBEDTLS_MPI_CHK(ecjpake_hash(md_info, grp, pf, G, &V, X, id, &h));
	MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&h, &h, x));	/* x*h */
	MBEDTLS_MPI_CHK(mbedtls_mpi_sub_mpi(&h, &v, &h));	/* v - x*h */
	MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&h, &h, &grp->N));	/* r */

	/* Write it out */
	MBEDTLS_MPI_CHK(mbedtls_ecp_tls_write_point(grp, &V, pf, &len, *p, end - *p));
	*p += len;

	len = mbedtls_mpi_size(&h);	/* actually r */
	if (end < *p || (size_t)(end - *p) < 1 + len || len > 255) {
		ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
		goto cleanup;
	}

	*(*p)++ = (unsigned char)(len & 0xFF);
	MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(&h, *p, len));	/* r */
	*p += len;

cleanup:
	mbedtls_ecp_point_free(&V);
	mbedtls_mpi_free(&v);
	mbedtls_mpi_free(&h);

	return (ret);
}

/*
 * Parse a ECJPAKEKeyKP (7.4.2.2.1) and check proof
 * Output: verified public key X
 */
static int ecjpake_kkp_read(const mbedtls_md_info_t *md_info, const mbedtls_ecp_group *grp, const int pf, const mbedtls_ecp_point *G, mbedtls_ecp_point *X, const char *id, const unsigned char **p, const unsigned char *end)
{
	int ret;

	if (end < *p) {
		return (MBEDTLS_ERR_ECP_BAD_INPUT_DATA);
	}

	/*
	 * struct {
	 *     ECPoint X;
	 *     ECSchnorrZKP zkp;
	 * } ECJPAKEKeyKP;
	 */
	MBEDTLS_MPI_CHK(mbedtls_ecp_tls_read_point(grp, X, p, end - *p));
	if (mbedtls_ecp_is_zero(X)) {
		ret = MBEDTLS_ERR_ECP_INVALID_KEY;
		goto cleanup;
	}

	MBEDTLS_MPI_CHK(ecjpake_zkp_read(md_info, grp, pf, G, X, id, p, end));

cleanup:
	return (ret);
}

/*
 * Generate an ECJPAKEKeyKP
 * Output: the serialized structure, plus private/public key pair
 */
static int ecjpake_kkp_write(const mbedtls_md_info_t *md_info, const mbedtls_ecp_group *grp, const int pf, const mbedtls_ecp_point *G, mbedtls_mpi *x, mbedtls_ecp_point *X, const char *id, unsigned char **p, const unsigned char *end, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
	int ret;
	size_t len;

	if (end < *p) {
		return (MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL);
	}

	/* Generate key (7.4.2.3.1) and write it out */
	MBEDTLS_MPI_CHK(mbedtls_ecp_gen_keypair_base((mbedtls_ecp_group *) grp, G, x, X, f_rng, p_rng));
	MBEDTLS_MPI_CHK(mbedtls_ecp_tls_write_point(grp, X, pf, &len, *p, end - *p));
	*p += len;

	/* Generate and write proof */
	MBEDTLS_MPI_CHK(ecjpake_zkp_write(md_info, grp, pf, G, x, X, id, p, end, f_rng, p_rng));

cleanup:
	return (ret);
}

/*
 * Read a ECJPAKEKeyKPPairList (7.4.2.3) and check proofs
 * Ouputs: verified peer public keys Xa, Xb
 */
static int ecjpake_kkpp_read(const mbedtls_md_info_t *md_info, const mbedtls_ecp_group *grp, const int pf, const mbedtls_ecp_point *G, mbedtls_ecp_point *Xa, mbedtls_ecp_point *Xb, const char *id, const unsigned char *buf, size_t len)
{
	int ret;
	const unsigned char *p = buf;
	const unsigned char *end = buf + len;

	/*
	 * struct {
	 *     ECJPAKEKeyKP ecjpake_key_kp_pair_list[2];
	 * } ECJPAKEKeyKPPairList;
	 */
	MBEDTLS_MPI_CHK(ecjpake_kkp_read(md_info, grp, pf, G, Xa, id, &p, end));
	MBEDTLS_MPI_CHK(ecjpake_kkp_read(md_info, grp, pf, G, Xb, id, &p, end));

	if (p != end) {
		ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
	}

cleanup:
	return (ret);
}

/*
 * Generate a ECJPAKEKeyKPPairList
 * Outputs: the serialized structure, plus two private/public key pairs
 */
static int ecjpake_kkpp_write(const mbedtls_md_info_t *md_info, const mbedtls_ecp_group *grp, const int pf, const mbedtls_ecp_point *G, mbedtls_mpi *xm1, mbedtls_ecp_point *Xa, mbedtls_mpi *xm2, mbedtls_ecp_point *Xb, const char *id, unsigned char *buf, size_t len, size_t *olen, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
	int ret;
	unsigned char *p = buf;
	const unsigned char *end = buf + len;

	MBEDTLS_MPI_CHK(ecjpake_kkp_write(md_info, grp, pf, G, xm1, Xa, id, &p, end, f_rng, p_rng));
	MBEDTLS_MPI_CHK(ecjpake_kkp_write(md_info, grp, pf, G, xm2, Xb, id, &p, end, f_rng, p_rng));

	*olen = p - buf;

cleanup:
	return (ret);
}

/*
 * Read and process the first round message
 */
int mbedtls_ecjpake_read_round_one(mbedtls_ecjpake_context *ctx, const unsigned char *buf, size_t len)
{
	return (ecjpake_kkpp_read(ctx->md_info, &ctx->grp, ctx->point_format, &ctx->grp.G, &ctx->Xp1, &ctx->Xp2, ID_PEER, buf, len));
}

/*
 * Generate and write the first round message
 */
int mbedtls_ecjpake_write_round_one(mbedtls_ecjpake_context *ctx, unsigned char *buf, size_t len, size_t *olen, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
	return (ecjpake_kkpp_write(ctx->md_info, &ctx->grp, ctx->point_format, &ctx->grp.G, &ctx->xm1, &ctx->Xm1, &ctx->xm2, &ctx->Xm2, ID_MINE, buf, len, olen, f_rng, p_rng));
}

/*
 * Compute the sum of three points R = A + B + C
 */
static int ecjpake_ecp_add3(mbedtls_ecp_group *grp, mbedtls_ecp_point *R, const mbedtls_ecp_point *A, const mbedtls_ecp_point *B, const mbedtls_ecp_point *C)
{
	int ret;
	mbedtls_mpi one;

	mbedtls_mpi_init(&one);

	MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&one, 1));
	MBEDTLS_MPI_CHK(mbedtls_ecp_muladd(grp, R, &one, A, &one, B));
	MBEDTLS_MPI_CHK(mbedtls_ecp_muladd(grp, R, &one, R, &one, C));

cleanup:
	mbedtls_mpi_free(&one);

	return (ret);
}

/*
 * Read and process second round message (C: 7.4.2.5, S: 7.4.2.6)
 */
int mbedtls_ecjpake_read_round_two(mbedtls_ecjpake_context *ctx, const unsigned char *buf, size_t len)
{
	int ret;
	const unsigned char *p = buf;
	const unsigned char *end = buf + len;
	mbedtls_ecp_group grp;
	mbedtls_ecp_point G;		/* C: GB, S: GA */

	mbedtls_ecp_group_init(&grp);
	mbedtls_ecp_point_init(&G);

	/*
	 * Server: GA = X3  + X4  + X1      (7.4.2.6.1)
	 * Client: GB = X1  + X2  + X3      (7.4.2.5.1)
	 * Unified: G = Xm1 + Xm2 + Xp1
	 * We need that before parsing in order to check Xp as we read it
	 */
	MBEDTLS_MPI_CHK(ecjpake_ecp_add3(&ctx->grp, &G, &ctx->Xm1, &ctx->Xm2, &ctx->Xp1));

	/*
	 * struct {
	 *     ECParameters curve_params;   // only client reading server msg
	 *     ECJPAKEKeyKP ecjpake_key_kp;
	 * } Client/ServerECJPAKEParams;
	 */
	if (ctx->role == MBEDTLS_ECJPAKE_CLIENT) {
		MBEDTLS_MPI_CHK(mbedtls_ecp_tls_read_group(&grp, &p, len));
		if (grp.id != ctx->grp.id) {
			ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
			goto cleanup;
		}
	}

	MBEDTLS_MPI_CHK(ecjpake_kkp_read(ctx->md_info, &ctx->grp, ctx->point_format, &G, &ctx->Xp, ID_PEER, &p, end));

	if (p != end) {
		ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
		goto cleanup;
	}

cleanup:
	mbedtls_ecp_group_free(&grp);
	mbedtls_ecp_point_free(&G);

	return (ret);
}

/*
 * Compute R = +/- X * S mod N, taking care not to leak S
 */
static int ecjpake_mul_secret(mbedtls_mpi *R, int sign, const mbedtls_mpi *X, const mbedtls_mpi *S, const mbedtls_mpi *N, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
	int ret;
	mbedtls_mpi b;				/* Blinding value, then s + N * blinding */

	mbedtls_mpi_init(&b);

	/* b = s + rnd-128-bit * N */
	MBEDTLS_MPI_CHK(mbedtls_mpi_fill_random(&b, 16, f_rng, p_rng));
	MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&b, &b, N));
	MBEDTLS_MPI_CHK(mbedtls_mpi_add_mpi(&b, &b, S));

	/* R = sign * X * b mod N */
	MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(R, X, &b));
	R->s *= sign;
	MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(R, R, N));

cleanup:
	mbedtls_mpi_free(&b);

	return (ret);
}

/*
 * Generate and write the second round message (S: 7.4.2.5, C: 7.4.2.6)
 */
int mbedtls_ecjpake_write_round_two(mbedtls_ecjpake_context *ctx, unsigned char *buf, size_t len, size_t *olen, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
	int ret;
	mbedtls_ecp_point G;		/* C: GA, S: GB */
	mbedtls_ecp_point Xm;		/* C: Xc, S: Xs */
	mbedtls_mpi xm;				/* C: xc, S: xs */
	unsigned char *p = buf;
	const unsigned char *end = buf + len;
	size_t ec_len;

	mbedtls_ecp_point_init(&G);
	mbedtls_ecp_point_init(&Xm);
	mbedtls_mpi_init(&xm);

	/*
	 * First generate private/public key pair (S: 7.4.2.5.1, C: 7.4.2.6.1)
	 *
	 * Client:  GA = X1  + X3  + X4  | xs = x2  * s | Xc = xc * GA
	 * Server:  GB = X3  + X1  + X2  | xs = x4  * s | Xs = xs * GB
	 * Unified: G  = Xm1 + Xp1 + Xp2 | xm = xm2 * s | Xm = xm * G
	 */
	MBEDTLS_MPI_CHK(ecjpake_ecp_add3(&ctx->grp, &G, &ctx->Xp1, &ctx->Xp2, &ctx->Xm1));
	MBEDTLS_MPI_CHK(ecjpake_mul_secret(&xm, 1, &ctx->xm2, &ctx->s, &ctx->grp.N, f_rng, p_rng));
	MBEDTLS_MPI_CHK(mbedtls_ecp_mul(&ctx->grp, &Xm, &xm, &G, f_rng, p_rng));

	/*
	 * Now write things out
	 *
	 * struct {
	 *     ECParameters curve_params;   // only server writing its message
	 *     ECJPAKEKeyKP ecjpake_key_kp;
	 * } Client/ServerECJPAKEParams;
	 */
	if (ctx->role == MBEDTLS_ECJPAKE_SERVER) {
		if (end < p) {
			ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
			goto cleanup;
		}
		MBEDTLS_MPI_CHK(mbedtls_ecp_tls_write_group(&ctx->grp, &ec_len, p, end - p));
		p += ec_len;
	}

	if (end < p) {
		ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
		goto cleanup;
	}
	MBEDTLS_MPI_CHK(mbedtls_ecp_tls_write_point(&ctx->grp, &Xm, ctx->point_format, &ec_len, p, end - p));
	p += ec_len;

	MBEDTLS_MPI_CHK(ecjpake_zkp_write(ctx->md_info, &ctx->grp, ctx->point_format, &G, &xm, &Xm, ID_MINE, &p, end, f_rng, p_rng));

	*olen = p - buf;

cleanup:
	mbedtls_ecp_point_free(&G);
	mbedtls_ecp_point_free(&Xm);
	mbedtls_mpi_free(&xm);

	return (ret);
}

/*
 * Derive PMS (7.4.2.7 / 7.4.2.8)
 */
int mbedtls_ecjpake_derive_secret(mbedtls_ecjpake_context *ctx, unsigned char *buf, size_t len, size_t *olen, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
	int ret;
	mbedtls_ecp_point K;
	mbedtls_mpi m_xm2_s, one;
	unsigned char kx[MBEDTLS_ECP_MAX_BYTES];
	size_t x_bytes;

	*olen = mbedtls_md_get_size(ctx->md_info);
	if (len < *olen) {
		return (MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL);
	}

	mbedtls_ecp_point_init(&K);
	mbedtls_mpi_init(&m_xm2_s);
	mbedtls_mpi_init(&one);

	MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&one, 1));

	/*
	 * Client:  K = ( Xs - X4  * x2  * s ) * x2
	 * Server:  K = ( Xc - X2  * x4  * s ) * x4
	 * Unified: K = ( Xp - Xp2 * xm2 * s ) * xm2
	 */
	MBEDTLS_MPI_CHK(ecjpake_mul_secret(&m_xm2_s, -1, &ctx->xm2, &ctx->s, &ctx->grp.N, f_rng, p_rng));
	MBEDTLS_MPI_CHK(mbedtls_ecp_muladd(&ctx->grp, &K, &one, &ctx->Xp, &m_xm2_s, &ctx->Xp2));
	MBEDTLS_MPI_CHK(mbedtls_ecp_mul(&ctx->grp, &K, &ctx->xm2, &K, f_rng, p_rng));

	/* PMS = SHA-256( K.X ) */
	x_bytes = (ctx->grp.pbits + 7) / 8;
	MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(&K.X, kx, x_bytes));
	MBEDTLS_MPI_CHK(mbedtls_md(ctx->md_info, kx, x_bytes, buf));

cleanup:
	mbedtls_ecp_point_free(&K);
	mbedtls_mpi_free(&m_xm2_s);
	mbedtls_mpi_free(&one);

	return (ret);
}

#undef ID_MINE
#undef ID_PEER

#if defined(MBEDTLS_SELF_TEST)

#if defined(MBEDTLS_PLATFORM_C)
#include "tls/platform.h"
#else
#include <stdio.h>
#define mbedtls_printf     printf
#endif

#if !defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) || \
!defined(MBEDTLS_SHA256_C)
int mbedtls_ecjpake_self_test(int verbose)
{
	(void)verbose;
	return (0);
}
#else

static const unsigned char ecjpake_test_password[] = {
	0x74, 0x68, 0x72, 0x65, 0x61, 0x64, 0x6a, 0x70, 0x61, 0x6b, 0x65, 0x74,
	0x65, 0x73, 0x74
};

static const unsigned char ecjpake_test_x1[] = {
	0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c,
	0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
	0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x21
};

static const unsigned char ecjpake_test_x2[] = {
	0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c,
	0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
	0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x81
};

static const unsigned char ecjpake_test_x3[] = {
	0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c,
	0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
	0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x81
};

static const unsigned char ecjpake_test_x4[] = {
	0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc,
	0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
	0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe1
};

static const unsigned char ecjpake_test_cli_one[] = {
	0x41, 0x04, 0xac, 0xcf, 0x01, 0x06, 0xef, 0x85, 0x8f, 0xa2, 0xd9, 0x19,
	0x33, 0x13, 0x46, 0x80, 0x5a, 0x78, 0xb5, 0x8b, 0xba, 0xd0, 0xb8, 0x44,
	0xe5, 0xc7, 0x89, 0x28, 0x79, 0x14, 0x61, 0x87, 0xdd, 0x26, 0x66, 0xad,
	0xa7, 0x81, 0xbb, 0x7f, 0x11, 0x13, 0x72, 0x25, 0x1a, 0x89, 0x10, 0x62,
	0x1f, 0x63, 0x4d, 0xf1, 0x28, 0xac, 0x48, 0xe3, 0x81, 0xfd, 0x6e, 0xf9,
	0x06, 0x07, 0x31, 0xf6, 0x94, 0xa4, 0x41, 0x04, 0x1d, 0xd0, 0xbd, 0x5d,
	0x45, 0x66, 0xc9, 0xbe, 0xd9, 0xce, 0x7d, 0xe7, 0x01, 0xb5, 0xe8, 0x2e,
	0x08, 0xe8, 0x4b, 0x73, 0x04, 0x66, 0x01, 0x8a, 0xb9, 0x03, 0xc7, 0x9e,
	0xb9, 0x82, 0x17, 0x22, 0x36, 0xc0, 0xc1, 0x72, 0x8a, 0xe4, 0xbf, 0x73,
	0x61, 0x0d, 0x34, 0xde, 0x44, 0x24, 0x6e, 0xf3, 0xd9, 0xc0, 0x5a, 0x22,
	0x36, 0xfb, 0x66, 0xa6, 0x58, 0x3d, 0x74, 0x49, 0x30, 0x8b, 0xab, 0xce,
	0x20, 0x72, 0xfe, 0x16, 0x66, 0x29, 0x92, 0xe9, 0x23, 0x5c, 0x25, 0x00,
	0x2f, 0x11, 0xb1, 0x50, 0x87, 0xb8, 0x27, 0x38, 0xe0, 0x3c, 0x94, 0x5b,
	0xf7, 0xa2, 0x99, 0x5d, 0xda, 0x1e, 0x98, 0x34, 0x58, 0x41, 0x04, 0x7e,
	0xa6, 0xe3, 0xa4, 0x48, 0x70, 0x37, 0xa9, 0xe0, 0xdb, 0xd7, 0x92, 0x62,
	0xb2, 0xcc, 0x27, 0x3e, 0x77, 0x99, 0x30, 0xfc, 0x18, 0x40, 0x9a, 0xc5,
	0x36, 0x1c, 0x5f, 0xe6, 0x69, 0xd7, 0x02, 0xe1, 0x47, 0x79, 0x0a, 0xeb,
	0x4c, 0xe7, 0xfd, 0x65, 0x75, 0xab, 0x0f, 0x6c, 0x7f, 0xd1, 0xc3, 0x35,
	0x93, 0x9a, 0xa8, 0x63, 0xba, 0x37, 0xec, 0x91, 0xb7, 0xe3, 0x2b, 0xb0,
	0x13, 0xbb, 0x2b, 0x41, 0x04, 0xa4, 0x95, 0x58, 0xd3, 0x2e, 0xd1, 0xeb,
	0xfc, 0x18, 0x16, 0xaf, 0x4f, 0xf0, 0x9b, 0x55, 0xfc, 0xb4, 0xca, 0x47,
	0xb2, 0xa0, 0x2d, 0x1e, 0x7c, 0xaf, 0x11, 0x79, 0xea, 0x3f, 0xe1, 0x39,
	0x5b, 0x22, 0xb8, 0x61, 0x96, 0x40, 0x16, 0xfa, 0xba, 0xf7, 0x2c, 0x97,
	0x56, 0x95, 0xd9, 0x3d, 0x4d, 0xf0, 0xe5, 0x19, 0x7f, 0xe9, 0xf0, 0x40,
	0x63, 0x4e, 0xd5, 0x97, 0x64, 0x93, 0x77, 0x87, 0xbe, 0x20, 0xbc, 0x4d,
	0xee, 0xbb, 0xf9, 0xb8, 0xd6, 0x0a, 0x33, 0x5f, 0x04, 0x6c, 0xa3, 0xaa,
	0x94, 0x1e, 0x45, 0x86, 0x4c, 0x7c, 0xad, 0xef, 0x9c, 0xf7, 0x5b, 0x3d,
	0x8b, 0x01, 0x0e, 0x44, 0x3e, 0xf0
};

static const unsigned char ecjpake_test_srv_one[] = {
	0x41, 0x04, 0x7e, 0xa6, 0xe3, 0xa4, 0x48, 0x70, 0x37, 0xa9, 0xe0, 0xdb,
	0xd7, 0x92, 0x62, 0xb2, 0xcc, 0x27, 0x3e, 0x77, 0x99, 0x30, 0xfc, 0x18,
	0x40, 0x9a, 0xc5, 0x36, 0x1c, 0x5f, 0xe6, 0x69, 0xd7, 0x02, 0xe1, 0x47,
	0x79, 0x0a, 0xeb, 0x4c, 0xe7, 0xfd, 0x65, 0x75, 0xab, 0x0f, 0x6c, 0x7f,
	0xd1, 0xc3, 0x35, 0x93, 0x9a, 0xa8, 0x63, 0xba, 0x37, 0xec, 0x91, 0xb7,
	0xe3, 0x2b, 0xb0, 0x13, 0xbb, 0x2b, 0x41, 0x04, 0x09, 0xf8, 0x5b, 0x3d,
	0x20, 0xeb, 0xd7, 0x88, 0x5c, 0xe4, 0x64, 0xc0, 0x8d, 0x05, 0x6d, 0x64,
	0x28, 0xfe, 0x4d, 0xd9, 0x28, 0x7a, 0xa3, 0x65, 0xf1, 0x31, 0xf4, 0x36,
	0x0f, 0xf3, 0x86, 0xd8, 0x46, 0x89, 0x8b, 0xc4, 0xb4, 0x15, 0x83, 0xc2,
	0xa5, 0x19, 0x7f, 0x65, 0xd7, 0x87, 0x42, 0x74, 0x6c, 0x12, 0xa5, 0xec,
	0x0a, 0x4f, 0xfe, 0x2f, 0x27, 0x0a, 0x75, 0x0a, 0x1d, 0x8f, 0xb5, 0x16,
	0x20, 0x93, 0x4d, 0x74, 0xeb, 0x43, 0xe5, 0x4d, 0xf4, 0x24, 0xfd, 0x96,
	0x30, 0x6c, 0x01, 0x17, 0xbf, 0x13, 0x1a, 0xfa, 0xbf, 0x90, 0xa9, 0xd3,
	0x3d, 0x11, 0x98, 0xd9, 0x05, 0x19, 0x37, 0x35, 0x14, 0x41, 0x04, 0x19,
	0x0a, 0x07, 0x70, 0x0f, 0xfa, 0x4b, 0xe6, 0xae, 0x1d, 0x79, 0xee, 0x0f,
	0x06, 0xae, 0xb5, 0x44, 0xcd, 0x5a, 0xdd, 0xaa, 0xbe, 0xdf, 0x70, 0xf8,
	0x62, 0x33, 0x21, 0x33, 0x2c, 0x54, 0xf3, 0x55, 0xf0, 0xfb, 0xfe, 0xc7,
	0x83, 0xed, 0x35, 0x9e, 0x5d, 0x0b, 0xf7, 0x37, 0x7a, 0x0f, 0xc4, 0xea,
	0x7a, 0xce, 0x47, 0x3c, 0x9c, 0x11, 0x2b, 0x41, 0xcc, 0xd4, 0x1a, 0xc5,
	0x6a, 0x56, 0x12, 0x41, 0x04, 0x36, 0x0a, 0x1c, 0xea, 0x33, 0xfc, 0xe6,
	0x41, 0x15, 0x64, 0x58, 0xe0, 0xa4, 0xea, 0xc2, 0x19, 0xe9, 0x68, 0x31,
	0xe6, 0xae, 0xbc, 0x88, 0xb3, 0xf3, 0x75, 0x2f, 0x93, 0xa0, 0x28, 0x1d,
	0x1b, 0xf1, 0xfb, 0x10, 0x60, 0x51, 0xdb, 0x96, 0x94, 0xa8, 0xd6, 0xe8,
	0x62, 0xa5, 0xef, 0x13, 0x24, 0xa3, 0xd9, 0xe2, 0x78, 0x94, 0xf1, 0xee,
	0x4f, 0x7c, 0x59, 0x19, 0x99, 0x65, 0xa8, 0xdd, 0x4a, 0x20, 0x91, 0x84,
	0x7d, 0x2d, 0x22, 0xdf, 0x3e, 0xe5, 0x5f, 0xaa, 0x2a, 0x3f, 0xb3, 0x3f,
	0xd2, 0xd1, 0xe0, 0x55, 0xa0, 0x7a, 0x7c, 0x61, 0xec, 0xfb, 0x8d, 0x80,
	0xec, 0x00, 0xc2, 0xc9, 0xeb, 0x12
};

static const unsigned char ecjpake_test_srv_two[] = {
	0x03, 0x00, 0x17, 0x41, 0x04, 0x0f, 0xb2, 0x2b, 0x1d, 0x5d, 0x11, 0x23,
	0xe0, 0xef, 0x9f, 0xeb, 0x9d, 0x8a, 0x2e, 0x59, 0x0a, 0x1f, 0x4d, 0x7c,
	0xed, 0x2c, 0x2b, 0x06, 0x58, 0x6e, 0x8f, 0x2a, 0x16, 0xd4, 0xeb, 0x2f,
	0xda, 0x43, 0x28, 0xa2, 0x0b, 0x07, 0xd8, 0xfd, 0x66, 0x76, 0x54, 0xca,
	0x18, 0xc5, 0x4e, 0x32, 0xa3, 0x33, 0xa0, 0x84, 0x54, 0x51, 0xe9, 0x26,
	0xee, 0x88, 0x04, 0xfd, 0x7a, 0xf0, 0xaa, 0xa7, 0xa6, 0x41, 0x04, 0x55,
	0x16, 0xea, 0x3e, 0x54, 0xa0, 0xd5, 0xd8, 0xb2, 0xce, 0x78, 0x6b, 0x38,
	0xd3, 0x83, 0x37, 0x00, 0x29, 0xa5, 0xdb, 0xe4, 0x45, 0x9c, 0x9d, 0xd6,
	0x01, 0xb4, 0x08, 0xa2, 0x4a, 0xe6, 0x46, 0x5c, 0x8a, 0xc9, 0x05, 0xb9,
	0xeb, 0x03, 0xb5, 0xd3, 0x69, 0x1c, 0x13, 0x9e, 0xf8, 0x3f, 0x1c, 0xd4,
	0x20, 0x0f, 0x6c, 0x9c, 0xd4, 0xec, 0x39, 0x22, 0x18, 0xa5, 0x9e, 0xd2,
	0x43, 0xd3, 0xc8, 0x20, 0xff, 0x72, 0x4a, 0x9a, 0x70, 0xb8, 0x8c, 0xb8,
	0x6f, 0x20, 0xb4, 0x34, 0xc6, 0x86, 0x5a, 0xa1, 0xcd, 0x79, 0x06, 0xdd,
	0x7c, 0x9b, 0xce, 0x35, 0x25, 0xf5, 0x08, 0x27, 0x6f, 0x26, 0x83, 0x6c
};

static const unsigned char ecjpake_test_cli_two[] = {
	0x41, 0x04, 0x69, 0xd5, 0x4e, 0xe8, 0x5e, 0x90, 0xce, 0x3f, 0x12, 0x46,
	0x74, 0x2d, 0xe5, 0x07, 0xe9, 0x39, 0xe8, 0x1d, 0x1d, 0xc1, 0xc5, 0xcb,
	0x98, 0x8b, 0x58, 0xc3, 0x10, 0xc9, 0xfd, 0xd9, 0x52, 0x4d, 0x93, 0x72,
	0x0b, 0x45, 0x54, 0x1c, 0x83, 0xee, 0x88, 0x41, 0x19, 0x1d, 0xa7, 0xce,
	0xd8, 0x6e, 0x33, 0x12, 0xd4, 0x36, 0x23, 0xc1, 0xd6, 0x3e, 0x74, 0x98,
	0x9a, 0xba, 0x4a, 0xff, 0xd1, 0xee, 0x41, 0x04, 0x07, 0x7e, 0x8c, 0x31,
	0xe2, 0x0e, 0x6b, 0xed, 0xb7, 0x60, 0xc1, 0x35, 0x93, 0xe6, 0x9f, 0x15,
	0xbe, 0x85, 0xc2, 0x7d, 0x68, 0xcd, 0x09, 0xcc, 0xb8, 0xc4, 0x18, 0x36,
	0x08, 0x91, 0x7c, 0x5c, 0x3d, 0x40, 0x9f, 0xac, 0x39, 0xfe, 0xfe, 0xe8,
	0x2f, 0x72, 0x92, 0xd3, 0x6f, 0x0d, 0x23, 0xe0, 0x55, 0x91, 0x3f, 0x45,
	0xa5, 0x2b, 0x85, 0xdd, 0x8a, 0x20, 0x52, 0xe9, 0xe1, 0x29, 0xbb, 0x4d,
	0x20, 0x0f, 0x01, 0x1f, 0x19, 0x48, 0x35, 0x35, 0xa6, 0xe8, 0x9a, 0x58,
	0x0c, 0x9b, 0x00, 0x03, 0xba, 0xf2, 0x14, 0x62, 0xec, 0xe9, 0x1a, 0x82,
	0xcc, 0x38, 0xdb, 0xdc, 0xae, 0x60, 0xd9, 0xc5, 0x4c
};

static const unsigned char ecjpake_test_pms[] = {
	0xf3, 0xd4, 0x7f, 0x59, 0x98, 0x44, 0xdb, 0x92, 0xa5, 0x69, 0xbb, 0xe7,
	0x98, 0x1e, 0x39, 0xd9, 0x31, 0xfd, 0x74, 0x3b, 0xf2, 0x2e, 0x98, 0xf9,
	0xb4, 0x38, 0xf7, 0x19, 0xd3, 0xc4, 0xf3, 0x51
};

/* Load my private keys and generate the correponding public keys */
static int ecjpake_test_load(mbedtls_ecjpake_context *ctx, const unsigned char *xm1, size_t len1, const unsigned char *xm2, size_t len2)
{
	int ret;

	MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&ctx->xm1, xm1, len1));
	MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&ctx->xm2, xm2, len2));
	MBEDTLS_MPI_CHK(mbedtls_ecp_mul(&ctx->grp, &ctx->Xm1, &ctx->xm1, &ctx->grp.G, NULL, NULL));
	MBEDTLS_MPI_CHK(mbedtls_ecp_mul(&ctx->grp, &ctx->Xm2, &ctx->xm2, &ctx->grp.G, NULL, NULL));

cleanup:
	return (ret);
}

/* For tests we don't need a secure RNG;
 * use the LGC from Numerical Recipes for simplicity */
static int ecjpake_lgc(void *p, unsigned char *out, size_t len)
{
	static uint32_t x = 42;
	(void)p;

	while (len > 0) {
		size_t use_len = len > 4 ? 4 : len;
		x = 1664525 * x + 1013904223;
		memcpy(out, &x, use_len);
		out += use_len;
		len -= use_len;
	}

	return (0);
}

#define TEST_ASSERT(x     \
do {                    \
if (x)             \
ret = 0;        \
else {               \
ret = 1;        \
goto cleanup;   \
}                   \
} while (0)

/*
 * Checkup routine
 */
int mbedtls_ecjpake_self_test(int verbose)
{
	int ret;
	mbedtls_ecjpake_context cli;
	mbedtls_ecjpake_context srv;
	unsigned char buf[512], pms[32];
	size_t len, pmslen;

	mbedtls_ecjpake_init(&cli);
	mbedtls_ecjpake_init(&srv);

	if (verbose != 0) {
		mbedtls_printf("  ECJPAKE test #0 (setup): ");
	}

	TEST_ASSERT(mbedtls_ecjpake_setup(&cli, MBEDTLS_ECJPAKE_CLIENT, MBEDTLS_MD_SHA256, MBEDTLS_ECP_DP_SECP256R1, ecjpake_test_password, sizeof(ecjpake_test_password)) == 0);

	TEST_ASSERT(mbedtls_ecjpake_setup(&srv, MBEDTLS_ECJPAKE_SERVER, MBEDTLS_MD_SHA256, MBEDTLS_ECP_DP_SECP256R1, ecjpake_test_password, sizeof(ecjpake_test_password)) == 0);

	if (verbose != 0) {
		mbedtls_printf("passed\n");
	}

	if (verbose != 0) {
		mbedtls_printf("  ECJPAKE test #1 (random handshake): ");
	}

	TEST_ASSERT(mbedtls_ecjpake_write_round_one(&cli, buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);

	TEST_ASSERT(mbedtls_ecjpake_read_round_one(&srv, buf, len) == 0);

	TEST_ASSERT(mbedtls_ecjpake_write_round_one(&srv, buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);

	TEST_ASSERT(mbedtls_ecjpake_read_round_one(&cli, buf, len) == 0);

	TEST_ASSERT(mbedtls_ecjpake_write_round_two(&srv, buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);

	TEST_ASSERT(mbedtls_ecjpake_read_round_two(&cli, buf, len) == 0);

	TEST_ASSERT(mbedtls_ecjpake_derive_secret(&cli, pms, sizeof(pms), &pmslen, ecjpake_lgc, NULL) == 0);

	TEST_ASSERT(mbedtls_ecjpake_write_round_two(&cli, buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);

	TEST_ASSERT(mbedtls_ecjpake_read_round_two(&srv, buf, len) == 0);

	TEST_ASSERT(mbedtls_ecjpake_derive_secret(&srv, buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);

	TEST_ASSERT(len == pmslen);
	TEST_ASSERT(memcmp(buf, pms, len) == 0);

	if (verbose != 0) {
		mbedtls_printf("passed\n");
	}

	if (verbose != 0) {
		mbedtls_printf("  ECJPAKE test #2 (reference handshake): ");
	}

	/* Simulate generation of round one */
	MBEDTLS_MPI_CHK(ecjpake_test_load(&cli, ecjpake_test_x1, sizeof(ecjpake_test_x1), ecjpake_test_x2, sizeof(ecjpake_test_x2)));

	MBEDTLS_MPI_CHK(ecjpake_test_load(&srv, ecjpake_test_x3, sizeof(ecjpake_test_x3), ecjpake_test_x4, sizeof(ecjpake_test_x4)));

	/* Read round one */
	TEST_ASSERT(mbedtls_ecjpake_read_round_one(&srv, ecjpake_test_cli_one, sizeof(ecjpake_test_cli_one)) == 0);

	TEST_ASSERT(mbedtls_ecjpake_read_round_one(&cli, ecjpake_test_srv_one, sizeof(ecjpake_test_srv_one)) == 0);

	/* Skip generation of round two, read round two */
	TEST_ASSERT(mbedtls_ecjpake_read_round_two(&cli, ecjpake_test_srv_two, sizeof(ecjpake_test_srv_two)) == 0);

	TEST_ASSERT(mbedtls_ecjpake_read_round_two(&srv, ecjpake_test_cli_two, sizeof(ecjpake_test_cli_two)) == 0);

	/* Server derives PMS */
	TEST_ASSERT(mbedtls_ecjpake_derive_secret(&srv, buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);

	TEST_ASSERT(len == sizeof(ecjpake_test_pms));
	TEST_ASSERT(memcmp(buf, ecjpake_test_pms, len) == 0);

	memset(buf, 0, len);		/* Avoid interferences with next step */

	/* Client derives PMS */
	TEST_ASSERT(mbedtls_ecjpake_derive_secret(&cli, buf, sizeof(buf), &len, ecjpake_lgc, NULL) == 0);

	TEST_ASSERT(len == sizeof(ecjpake_test_pms));
	TEST_ASSERT(memcmp(buf, ecjpake_test_pms, len) == 0);

	if (verbose != 0) {
		mbedtls_printf("passed\n");
	}

cleanup:
	mbedtls_ecjpake_free(&cli);
	mbedtls_ecjpake_free(&srv);

	if (ret != 0) {
		if (verbose != 0) {
			mbedtls_printf("failed\n");
		}

		ret = 1;
	}

	if (verbose != 0) {
		mbedtls_printf("\n");
	}

	return (ret);
}

#undef TEST_ASSERT

#endif							/* MBEDTLS_ECP_DP_SECP256R1_ENABLED && MBEDTLS_SHA256_C */

#endif							/* MBEDTLS_SELF_TEST */

#endif							/* MBEDTLS_ECJPAKE_C */
